算一算,直接在橫線里填出結(jié)果.
1
6
×(1÷
2
3
)
=
1
4
1
4
5
6
×
3
5
÷
6
7
=
7
12
7
12
5
9
×
3
5
÷
6
7
=
7
18
7
18
2
3
×
1
4
×
3
8
=
1
16
1
16
5
8
×
4
7
×
3
5
=
3
14
3
14
4
7
÷3÷
1
2
=
8
21
8
21
4
5
+
3
4
)×20=
31
31
12×
5
6
+
2
5
÷
4
15
=
11
1
2
11
1
2
分析:①先算括號(hào)內(nèi)的,再算括號(hào)外的;②③把除法改為乘法,約分計(jì)算;④⑤約分計(jì)算;⑥把除法改為乘法,再計(jì)算;⑦運(yùn)用乘法分配律簡算;⑧先算乘除,再算加法.
解答:
解:
1
6
×(1÷
2
3
)
=
1
4
5
6
×
3
5
÷
6
7
=
7
12
5
9
×
3
5
÷
6
7
=
7
18
2
3
×
1
4
×
3
8
=
1
16
5
8
×
4
7
×
3
5
=
3
14
4
7
÷3÷
1
2
=
8
21
4
5
+
3
4
)×20=31
12×
5
6
+
2
5
÷
4
15
=11
1
2
點(diǎn)評(píng):此題考查了分?jǐn)?shù)的四則運(yùn)算,注意乘除法的轉(zhuǎn)化,以及運(yùn)用運(yùn)算定律進(jìn)行簡算.
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